compiler/rustc_hir_analysis/src/check/intrinsic.rs

   1 //! Type-checking for the rust-intrinsic and platform-intrinsic
   2 //! intrinsics that the compiler exposes.
   3
   4 use crate::errors::{
   5     UnrecognizedAtomicOperation, UnrecognizedIntrinsicFunction,
   6     WrongNumberOfGenericArgumentsToIntrinsic,
   7 };
   8 use crate::require_same_types;
   9
  10 use hir::def_id::DefId;
  11 use rustc_errors::{struct_span_err, DiagnosticMessage};
  12 use rustc_hir as hir;
  13 use rustc_middle::traits::{ObligationCause, ObligationCauseCode};
  14 use rustc_middle::ty::{self, TyCtxt};
  15 use rustc_span::symbol::{kw, sym, Symbol};
  16 use rustc_target::spec::abi::Abi;
  17
  18 use std::iter;
  19
  20 fn equate_intrinsic_type<'tcx>(
  21     tcx: TyCtxt<'tcx>,
  22     it: &hir::ForeignItem<'_>,
  23     n_tps: usize,
  24     n_lts: usize,
  25     sig: ty::PolyFnSig<'tcx>,
  26 ) {
  27     let (own_counts, span) = match &it.kind {
  28         hir::ForeignItemKind::Fn(.., generics) => {
  29             let own_counts = tcx.generics_of(it.owner_id.to_def_id()).own_counts();
  30             (own_counts, generics.span)
  31         }
  32         _ => {
  33             struct_span_err!(tcx.sess, it.span, E0622, "intrinsic must be a function")
  34                 .span_label(it.span, "expected a function")
  35                 .emit();
  36             return;
  37         }
  38     };
  39
  40     let gen_count_ok = |found: usize, expected: usize, descr: &str| -> bool {
  41         if found != expected {
  42             tcx.sess.emit_err(WrongNumberOfGenericArgumentsToIntrinsic {
  43                 span,
  44                 found,
  45                 expected,
  46                 descr,
  47             });
  48             false
  49         } else {
  50             true
  51         }
  52     };
  53
  54     if gen_count_ok(own_counts.lifetimes, n_lts, "lifetime")
  55         && gen_count_ok(own_counts.types, n_tps, "type")
  56         && gen_count_ok(own_counts.consts, 0, "const")
  57     {
  58         let fty = tcx.mk_fn_ptr(sig);
  59         let cause = ObligationCause::new(it.span, it.hir_id(), ObligationCauseCode::IntrinsicType);
  60         require_same_types(tcx, &cause, tcx.mk_fn_ptr(tcx.fn_sig(it.owner_id)), fty);
  61     }
  62 }
  63
  64 /// Returns the unsafety of the given intrinsic.
  65 pub fn intrinsic_operation_unsafety(tcx: TyCtxt<'_>, intrinsic_id: DefId) -> hir::Unsafety {
  66     let has_safe_attr = match tcx.has_attr(intrinsic_id, sym::rustc_safe_intrinsic) {
  67         true => hir::Unsafety::Normal,
  68         false => hir::Unsafety::Unsafe,
  69     };
  70     let is_in_list = match tcx.item_name(intrinsic_id) {
  71         // When adding a new intrinsic to this list,
  72         // it's usually worth updating that intrinsic's documentation
  73         // to note that it's safe to call, since
  74         // safe extern fns are otherwise unprecedented.
  75         sym::abort
  76         | sym::assert_inhabited
  77         | sym::assert_zero_valid
  78         | sym::assert_mem_uninitialized_valid
  79         | sym::size_of
  80         | sym::min_align_of
  81         | sym::needs_drop
  82         | sym::caller_location
  83         | sym::add_with_overflow
  84         | sym::sub_with_overflow
  85         | sym::mul_with_overflow
  86         | sym::wrapping_add
  87         | sym::wrapping_sub
  88         | sym::wrapping_mul
  89         | sym::saturating_add
  90         | sym::saturating_sub
  91         | sym::rotate_left
  92         | sym::rotate_right
  93         | sym::ctpop
  94         | sym::ctlz
  95         | sym::cttz
  96         | sym::bswap
  97         | sym::bitreverse
  98         | sym::discriminant_value
  99         | sym::type_id
 100         | sym::likely
 101         | sym::unlikely
 102         | sym::ptr_guaranteed_cmp
 103         | sym::minnumf32
 104         | sym::minnumf64
 105         | sym::maxnumf32
 106         | sym::rustc_peek
 107         | sym::maxnumf64
 108         | sym::type_name
 109         | sym::forget
 110         | sym::black_box
 111         | sym::variant_count
 112         | sym::ptr_mask => hir::Unsafety::Normal,
 113         _ => hir::Unsafety::Unsafe,
 114     };
 115
 116     if has_safe_attr != is_in_list {
 117         tcx.sess.struct_span_err(
 118             tcx.def_span(intrinsic_id),
 119             DiagnosticMessage::Str(format!(
 120                     "intrinsic safety mismatch between list of intrinsics within the compiler and core library intrinsics for intrinsic `{}`",
 121                     tcx.item_name(intrinsic_id)
 122         ))).emit();
 123     }
 124
 125     is_in_list
 126 }
 127
 128 /// Remember to add all intrinsics here, in `compiler/rustc_codegen_llvm/src/intrinsic.rs`,
 129 /// and in `library/core/src/intrinsics.rs`.
 130 pub fn check_intrinsic_type(tcx: TyCtxt<'_>, it: &hir::ForeignItem<'_>) {
 131     let param = |n| tcx.mk_ty_param(n, Symbol::intern(&format!("P{}", n)));
 132     let intrinsic_id = it.owner_id.to_def_id();
 133     let intrinsic_name = tcx.item_name(intrinsic_id);
 134     let name_str = intrinsic_name.as_str();
 135
 136     let bound_vars = tcx.mk_bound_variable_kinds(
 137         [
 138             ty::BoundVariableKind::Region(ty::BrAnon(0, None)),
 139             ty::BoundVariableKind::Region(ty::BrEnv),
 140         ]
 141         .iter()
 142         .copied(),
 143     );
 144     let mk_va_list_ty = |mutbl| {
 145         tcx.lang_items().va_list().map(|did| {
 146             let region = tcx.mk_region(ty::ReLateBound(
 147                 ty::INNERMOST,
 148                 ty::BoundRegion { var: ty::BoundVar::from_u32(0), kind: ty::BrAnon(0, None) },
 149             ));
 150             let env_region = tcx.mk_region(ty::ReLateBound(
 151                 ty::INNERMOST,
 152                 ty::BoundRegion { var: ty::BoundVar::from_u32(1), kind: ty::BrEnv },
 153             ));
 154             let va_list_ty = tcx.bound_type_of(did).subst(tcx, &[region.into()]);
 155             (tcx.mk_ref(env_region, ty::TypeAndMut { ty: va_list_ty, mutbl }), va_list_ty)
 156         })
 157     };
 158
 159     let (n_tps, n_lts, inputs, output, unsafety) = if name_str.starts_with("atomic_") {
 160         let split: Vec<&str> = name_str.split('_').collect();
 161         assert!(split.len() >= 2, "Atomic intrinsic in an incorrect format");
 162
 163         //We only care about the operation here
 164         let (n_tps, inputs, output) = match split[1] {
 165             "cxchg" | "cxchgweak" => (
 166                 1,
 167                 vec![tcx.mk_mut_ptr(param(0)), param(0), param(0)],
 168                 tcx.intern_tup(&[param(0), tcx.types.bool]),
 169             ),
 170             "load" => (1, vec![tcx.mk_imm_ptr(param(0))], param(0)),
 171             "store" => (1, vec![tcx.mk_mut_ptr(param(0)), param(0)], tcx.mk_unit()),
 172
 173             "xchg" | "xadd" | "xsub" | "and" | "nand" | "or" | "xor" | "max" | "min" | "umax"
 174             | "umin" => (1, vec![tcx.mk_mut_ptr(param(0)), param(0)], param(0)),
 175             "fence" | "singlethreadfence" => (0, Vec::new(), tcx.mk_unit()),
 176             op => {
 177                 tcx.sess.emit_err(UnrecognizedAtomicOperation { span: it.span, op });
 178                 return;
 179             }
 180         };
 181         (n_tps, 0, inputs, output, hir::Unsafety::Unsafe)
 182     } else {
 183         let unsafety = intrinsic_operation_unsafety(tcx, intrinsic_id);
 184         let (n_tps, inputs, output) = match intrinsic_name {
 185             sym::abort => (0, Vec::new(), tcx.types.never),
 186             sym::unreachable => (0, Vec::new(), tcx.types.never),
 187             sym::breakpoint => (0, Vec::new(), tcx.mk_unit()),
 188             sym::size_of | sym::pref_align_of | sym::min_align_of | sym::variant_count => {
 189                 (1, Vec::new(), tcx.types.usize)
 190             }
 191             sym::size_of_val | sym::min_align_of_val => {
 192                 (1, vec![tcx.mk_imm_ptr(param(0))], tcx.types.usize)
 193             }
 194             sym::rustc_peek => (1, vec![param(0)], param(0)),
 195             sym::caller_location => (0, vec![], tcx.caller_location_ty()),
 196             sym::assert_inhabited
 197             | sym::assert_zero_valid
 198             | sym::assert_mem_uninitialized_valid => (1, Vec::new(), tcx.mk_unit()),
 199             sym::forget => (1, vec![param(0)], tcx.mk_unit()),
 200             sym::transmute => (2, vec![param(0)], param(1)),
 201             sym::prefetch_read_data
 202             | sym::prefetch_write_data
 203             | sym::prefetch_read_instruction
 204             | sym::prefetch_write_instruction => (
 205                 1,
 206                 vec![
 207                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 208                     tcx.types.i32,
 209                 ],
 210                 tcx.mk_unit(),
 211             ),
 212             sym::drop_in_place => (1, vec![tcx.mk_mut_ptr(param(0))], tcx.mk_unit()),
 213             sym::needs_drop => (1, Vec::new(), tcx.types.bool),
 214
 215             sym::type_name => (1, Vec::new(), tcx.mk_static_str()),
 216             sym::type_id => (1, Vec::new(), tcx.types.u64),
 217             sym::offset | sym::arith_offset => (
 218                 1,
 219                 vec![
 220                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 221                     tcx.types.isize,
 222                 ],
 223                 tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 224             ),
 225             sym::ptr_mask => (
 226                 1,
 227                 vec![
 228                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 229                     tcx.types.usize,
 230                 ],
 231                 tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 232             ),
 233
 234             sym::copy | sym::copy_nonoverlapping => (
 235                 1,
 236                 vec![
 237                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 238                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Mut }),
 239                     tcx.types.usize,
 240                 ],
 241                 tcx.mk_unit(),
 242             ),
 243             sym::volatile_copy_memory | sym::volatile_copy_nonoverlapping_memory => (
 244                 1,
 245                 vec![
 246                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Mut }),
 247                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Not }),
 248                     tcx.types.usize,
 249                 ],
 250                 tcx.mk_unit(),
 251             ),
 252             sym::write_bytes | sym::volatile_set_memory => (
 253                 1,
 254                 vec![
 255                     tcx.mk_ptr(ty::TypeAndMut { ty: param(0), mutbl: hir::Mutability::Mut }),
 256                     tcx.types.u8,
 257                     tcx.types.usize,
 258                 ],
 259                 tcx.mk_unit(),
 260             ),
 261             sym::sqrtf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 262             sym::sqrtf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 263             sym::powif32 => (0, vec![tcx.types.f32, tcx.types.i32], tcx.types.f32),
 264             sym::powif64 => (0, vec![tcx.types.f64, tcx.types.i32], tcx.types.f64),
 265             sym::sinf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 266             sym::sinf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 267             sym::cosf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 268             sym::cosf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 269             sym::powf32 => (0, vec![tcx.types.f32, tcx.types.f32], tcx.types.f32),
 270             sym::powf64 => (0, vec![tcx.types.f64, tcx.types.f64], tcx.types.f64),
 271             sym::expf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 272             sym::expf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 273             sym::exp2f32 => (0, vec![tcx.types.f32], tcx.types.f32),
 274             sym::exp2f64 => (0, vec![tcx.types.f64], tcx.types.f64),
 275             sym::logf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 276             sym::logf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 277             sym::log10f32 => (0, vec![tcx.types.f32], tcx.types.f32),
 278             sym::log10f64 => (0, vec![tcx.types.f64], tcx.types.f64),
 279             sym::log2f32 => (0, vec![tcx.types.f32], tcx.types.f32),
 280             sym::log2f64 => (0, vec![tcx.types.f64], tcx.types.f64),
 281             sym::fmaf32 => (0, vec![tcx.types.f32, tcx.types.f32, tcx.types.f32], tcx.types.f32),
 282             sym::fmaf64 => (0, vec![tcx.types.f64, tcx.types.f64, tcx.types.f64], tcx.types.f64),
 283             sym::fabsf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 284             sym::fabsf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 285             sym::minnumf32 => (0, vec![tcx.types.f32, tcx.types.f32], tcx.types.f32),
 286             sym::minnumf64 => (0, vec![tcx.types.f64, tcx.types.f64], tcx.types.f64),
 287             sym::maxnumf32 => (0, vec![tcx.types.f32, tcx.types.f32], tcx.types.f32),
 288             sym::maxnumf64 => (0, vec![tcx.types.f64, tcx.types.f64], tcx.types.f64),
 289             sym::copysignf32 => (0, vec![tcx.types.f32, tcx.types.f32], tcx.types.f32),
 290             sym::copysignf64 => (0, vec![tcx.types.f64, tcx.types.f64], tcx.types.f64),
 291             sym::floorf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 292             sym::floorf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 293             sym::ceilf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 294             sym::ceilf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 295             sym::truncf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 296             sym::truncf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 297             sym::rintf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 298             sym::rintf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 299             sym::nearbyintf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 300             sym::nearbyintf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 301             sym::roundf32 => (0, vec![tcx.types.f32], tcx.types.f32),
 302             sym::roundf64 => (0, vec![tcx.types.f64], tcx.types.f64),
 303
 304             sym::volatile_load | sym::unaligned_volatile_load => {
 305                 (1, vec![tcx.mk_imm_ptr(param(0))], param(0))
 306             }
 307             sym::volatile_store | sym::unaligned_volatile_store => {
 308                 (1, vec![tcx.mk_mut_ptr(param(0)), param(0)], tcx.mk_unit())
 309             }
 310
 311             sym::ctpop
 312             | sym::ctlz
 313             | sym::ctlz_nonzero
 314             | sym::cttz
 315             | sym::cttz_nonzero
 316             | sym::bswap
 317             | sym::bitreverse => (1, vec![param(0)], param(0)),
 318
 319             sym::add_with_overflow | sym::sub_with_overflow | sym::mul_with_overflow => {
 320                 (1, vec![param(0), param(0)], tcx.intern_tup(&[param(0), tcx.types.bool]))
 321             }
 322
 323             sym::ptr_guaranteed_cmp => {
 324                 (1, vec![tcx.mk_imm_ptr(param(0)), tcx.mk_imm_ptr(param(0))], tcx.types.u8)
 325             }
 326
 327             sym::const_allocate => {
 328                 (0, vec![tcx.types.usize, tcx.types.usize], tcx.mk_mut_ptr(tcx.types.u8))
 329             }
 330             sym::const_deallocate => (
 331                 0,
 332                 vec![tcx.mk_mut_ptr(tcx.types.u8), tcx.types.usize, tcx.types.usize],
 333                 tcx.mk_unit(),
 334             ),
 335
 336             sym::ptr_offset_from => {
 337                 (1, vec![tcx.mk_imm_ptr(param(0)), tcx.mk_imm_ptr(param(0))], tcx.types.isize)
 338             }
 339             sym::ptr_offset_from_unsigned => {
 340                 (1, vec![tcx.mk_imm_ptr(param(0)), tcx.mk_imm_ptr(param(0))], tcx.types.usize)
 341             }
 342             sym::unchecked_div | sym::unchecked_rem | sym::exact_div => {
 343                 (1, vec![param(0), param(0)], param(0))
 344             }
 345             sym::unchecked_shl | sym::unchecked_shr | sym::rotate_left | sym::rotate_right => {
 346                 (1, vec![param(0), param(0)], param(0))
 347             }
 348             sym::unchecked_add | sym::unchecked_sub | sym::unchecked_mul => {
 349                 (1, vec![param(0), param(0)], param(0))
 350             }
 351             sym::wrapping_add | sym::wrapping_sub | sym::wrapping_mul => {
 352                 (1, vec![param(0), param(0)], param(0))
 353             }
 354             sym::saturating_add | sym::saturating_sub => (1, vec![param(0), param(0)], param(0)),
 355             sym::fadd_fast | sym::fsub_fast | sym::fmul_fast | sym::fdiv_fast | sym::frem_fast => {
 356                 (1, vec![param(0), param(0)], param(0))
 357             }
 358             sym::float_to_int_unchecked => (2, vec![param(0)], param(1)),
 359
 360             sym::assume => (0, vec![tcx.types.bool], tcx.mk_unit()),
 361             sym::likely => (0, vec![tcx.types.bool], tcx.types.bool),
 362             sym::unlikely => (0, vec![tcx.types.bool], tcx.types.bool),
 363
 364             sym::discriminant_value => {
 365                 let assoc_items = tcx.associated_item_def_ids(
 366                     tcx.require_lang_item(hir::LangItem::DiscriminantKind, None),
 367                 );
 368                 let discriminant_def_id = assoc_items[0];
 369
 370                 let br =
 371                     ty::BoundRegion { var: ty::BoundVar::from_u32(0), kind: ty::BrAnon(0, None) };
 372                 (
 373                     1,
 374                     vec![
 375                         tcx.mk_imm_ref(tcx.mk_region(ty::ReLateBound(ty::INNERMOST, br)), param(0)),
 376                     ],
 377                     tcx.mk_projection(discriminant_def_id, tcx.mk_substs([param(0).into()].iter())),
 378                 )
 379             }
 380
 381             kw::Try => {
 382                 let mut_u8 = tcx.mk_mut_ptr(tcx.types.u8);
 383                 let try_fn_ty = ty::Binder::dummy(tcx.mk_fn_sig(
 384                     iter::once(mut_u8),
 385                     tcx.mk_unit(),
 386                     false,
 387                     hir::Unsafety::Normal,
 388                     Abi::Rust,
 389                 ));
 390                 let catch_fn_ty = ty::Binder::dummy(tcx.mk_fn_sig(
 391                     [mut_u8, mut_u8].iter().cloned(),
 392                     tcx.mk_unit(),
 393                     false,
 394                     hir::Unsafety::Normal,
 395                     Abi::Rust,
 396                 ));
 397                 (
 398                     0,
 399                     vec![tcx.mk_fn_ptr(try_fn_ty), mut_u8, tcx.mk_fn_ptr(catch_fn_ty)],
 400                     tcx.types.i32,
 401                 )
 402             }
 403
 404             sym::va_start | sym::va_end => match mk_va_list_ty(hir::Mutability::Mut) {
 405                 Some((va_list_ref_ty, _)) => (0, vec![va_list_ref_ty], tcx.mk_unit()),
 406                 None => bug!("`va_list` language item needed for C-variadic intrinsics"),
 407             },
 408
 409             sym::va_copy => match mk_va_list_ty(hir::Mutability::Not) {
 410                 Some((va_list_ref_ty, va_list_ty)) => {
 411                     let va_list_ptr_ty = tcx.mk_mut_ptr(va_list_ty);
 412                     (0, vec![va_list_ptr_ty, va_list_ref_ty], tcx.mk_unit())
 413                 }
 414                 None => bug!("`va_list` language item needed for C-variadic intrinsics"),
 415             },
 416
 417             sym::va_arg => match mk_va_list_ty(hir::Mutability::Mut) {
 418                 Some((va_list_ref_ty, _)) => (1, vec![va_list_ref_ty], param(0)),
 419                 None => bug!("`va_list` language item needed for C-variadic intrinsics"),
 420             },
 421
 422             sym::nontemporal_store => (1, vec![tcx.mk_mut_ptr(param(0)), param(0)], tcx.mk_unit()),
 423
 424             sym::raw_eq => {
 425                 let br =
 426                     ty::BoundRegion { var: ty::BoundVar::from_u32(0), kind: ty::BrAnon(0, None) };
 427                 let param_ty =
 428                     tcx.mk_imm_ref(tcx.mk_region(ty::ReLateBound(ty::INNERMOST, br)), param(0));
 429                 (1, vec![param_ty; 2], tcx.types.bool)
 430             }
 431
 432             sym::black_box => (1, vec![param(0)], param(0)),
 433
 434             sym::const_eval_select => (4, vec![param(0), param(1), param(2)], param(3)),
 435
 436             sym::vtable_size | sym::vtable_align => {
 437                 (0, vec![tcx.mk_imm_ptr(tcx.mk_unit())], tcx.types.usize)
 438             }
 439
 440             other => {
 441                 tcx.sess.emit_err(UnrecognizedIntrinsicFunction { span: it.span, name: other });
 442                 return;
 443             }
 444         };
 445         (n_tps, 0, inputs, output, unsafety)
 446     };
 447     let sig = tcx.mk_fn_sig(inputs.into_iter(), output, false, unsafety, Abi::RustIntrinsic);
 448     let sig = ty::Binder::bind_with_vars(sig, bound_vars);
 449     equate_intrinsic_type(tcx, it, n_tps, n_lts, sig)
 450 }
 451
 452 /// Type-check `extern "platform-intrinsic" { ... }` functions.
 453 pub fn check_platform_intrinsic_type(tcx: TyCtxt<'_>, it: &hir::ForeignItem<'_>) {
 454     let param = |n| {
 455         let name = Symbol::intern(&format!("P{}", n));
 456         tcx.mk_ty_param(n, name)
 457     };
 458
 459     let name = it.ident.name;
 460
 461     let (n_tps, inputs, output) = match name {
 462         sym::simd_eq | sym::simd_ne | sym::simd_lt | sym::simd_le | sym::simd_gt | sym::simd_ge => {
 463             (2, vec![param(0), param(0)], param(1))
 464         }
 465         sym::simd_add
 466         | sym::simd_sub
 467         | sym::simd_mul
 468         | sym::simd_rem
 469         | sym::simd_div
 470         | sym::simd_shl
 471         | sym::simd_shr
 472         | sym::simd_and
 473         | sym::simd_or
 474         | sym::simd_xor
 475         | sym::simd_fmin
 476         | sym::simd_fmax
 477         | sym::simd_fpow
 478         | sym::simd_saturating_add
 479         | sym::simd_saturating_sub => (1, vec![param(0), param(0)], param(0)),
 480         sym::simd_arith_offset => (2, vec![param(0), param(1)], param(0)),
 481         sym::simd_neg
 482         | sym::simd_fsqrt
 483         | sym::simd_fsin
 484         | sym::simd_fcos
 485         | sym::simd_fexp
 486         | sym::simd_fexp2
 487         | sym::simd_flog2
 488         | sym::simd_flog10
 489         | sym::simd_flog
 490         | sym::simd_fabs
 491         | sym::simd_ceil
 492         | sym::simd_floor
 493         | sym::simd_round
 494         | sym::simd_trunc => (1, vec![param(0)], param(0)),
 495         sym::simd_fpowi => (1, vec![param(0), tcx.types.i32], param(0)),
 496         sym::simd_fma => (1, vec![param(0), param(0), param(0)], param(0)),
 497         sym::simd_gather => (3, vec![param(0), param(1), param(2)], param(0)),
 498         sym::simd_scatter => (3, vec![param(0), param(1), param(2)], tcx.mk_unit()),
 499         sym::simd_insert => (2, vec![param(0), tcx.types.u32, param(1)], param(0)),
 500         sym::simd_extract => (2, vec![param(0), tcx.types.u32], param(1)),
 501         sym::simd_cast
 502         | sym::simd_as
 503         | sym::simd_cast_ptr
 504         | sym::simd_expose_addr
 505         | sym::simd_from_exposed_addr => (2, vec![param(0)], param(1)),
 506         sym::simd_bitmask => (2, vec![param(0)], param(1)),
 507         sym::simd_select | sym::simd_select_bitmask => {
 508             (2, vec![param(0), param(1), param(1)], param(1))
 509         }
 510         sym::simd_reduce_all | sym::simd_reduce_any => (1, vec![param(0)], tcx.types.bool),
 511         sym::simd_reduce_add_ordered | sym::simd_reduce_mul_ordered => {
 512             (2, vec![param(0), param(1)], param(1))
 513         }
 514         sym::simd_reduce_add_unordered
 515         | sym::simd_reduce_mul_unordered
 516         | sym::simd_reduce_and
 517         | sym::simd_reduce_or
 518         | sym::simd_reduce_xor
 519         | sym::simd_reduce_min
 520         | sym::simd_reduce_max
 521         | sym::simd_reduce_min_nanless
 522         | sym::simd_reduce_max_nanless => (2, vec![param(0)], param(1)),
 523         sym::simd_shuffle => (3, vec![param(0), param(0), param(1)], param(2)),
 524         name if name.as_str().starts_with("simd_shuffle") => {
 525             match name.as_str()["simd_shuffle".len()..].parse() {
 526                 Ok(n) => {
 527                     let params = vec![param(0), param(0), tcx.mk_array(tcx.types.u32, n)];
 528                     (2, params, param(1))
 529                 }
 530                 Err(_) => {
 531                     let msg =
 532                         format!("unrecognized platform-specific intrinsic function: `{name}`");
 533                     tcx.sess.struct_span_err(it.span, &msg).emit();
 534                     return;
 535                 }
 536             }
 537         }
 538         _ => {
 539             let msg = format!("unrecognized platform-specific intrinsic function: `{name}`");
 540             tcx.sess.struct_span_err(it.span, &msg).emit();
 541             return;
 542         }
 543     };
 544
 545     let sig = tcx.mk_fn_sig(
 546         inputs.into_iter(),
 547         output,
 548         false,
 549         hir::Unsafety::Unsafe,
 550         Abi::PlatformIntrinsic,
 551     );
 552     let sig = ty::Binder::dummy(sig);
 553     equate_intrinsic_type(tcx, it, n_tps, 0, sig)
 554 }